java - 进行椭圆曲线加密时出现无效 key 异常

Question

当我使用 flexyprovider 进行椭圆曲线加密时，出现此错误。我收到 InvalidKeyException 但我不知道如何解决它:

Exception in thread "main" java.security.InvalidKeyException: Illegal key size
at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1024)
at javax.crypto.Cipher.init(Cipher.java:1345)
at javax.crypto.Cipher.init(Cipher.java:1282)
at ExampleECIES.main(ExampleECIES.java:43)

这是我的代码

public class ExampleECIES {

    public static void main(String[] args) throws Exception {

    Security.addProvider(new FlexiCoreProvider());
    Security.addProvider(new FlexiECProvider());

    KeyPairGenerator kpg = KeyPairGenerator.getInstance("ECIES", "FlexiEC");

    CurveParams ecParams = new BrainpoolP160r1();

    kpg.initialize(ecParams, new SecureRandom());
    KeyPair keyPair = kpg.generateKeyPair();
    PublicKey pubKey = keyPair.getPublic();
    PrivateKey privKey = keyPair.getPrivate();

    // Encrypt

    Cipher cipher = Cipher.getInstance("ECIES", "FlexiEC");

    IESParameterSpec iesParams = new IESParameterSpec("AES128_CBC",
        "HmacSHA1", null, null);
    System.out.println(iesParams);
    cipher.init(Cipher.ENCRYPT_MODE, pubKey, iesParams);

    String cleartextFile = "cleartext.txt";
    String ciphertextFile = "ciphertextECIES.txt";

    byte[] block = new byte[64];
    FileInputStream fis = new FileInputStream(cleartextFile);
    FileOutputStream fos = new FileOutputStream(ciphertextFile);
    CipherOutputStream cos = new CipherOutputStream(fos, cipher);

    int i;
    while ((i = fis.read(block)) != -1) {
        cos.write(block, 0, i);
    }
    cos.close();

    // Decrypt

    String cleartextAgainFile = "cleartextAgainECIES.txt";

    cipher.init(Cipher.DECRYPT_MODE, privKey, iesParams);

    fis = new FileInputStream(ciphertextFile);
    CipherInputStream cis = new CipherInputStream(fis, cipher);
    fos = new FileOutputStream(cleartextAgainFile);

    while ((i = cis.read(block)) != -1) {
        fos.write(block, 0, i);
    }
    fos.close();
    }

}

有人可以帮我吗？我使用的是 JDK 版本 1.7.0_25。

Answer 1

在查看同一个示例时，我遇到了同样的问题。我用这个answer解决了它.

根本原因:

默认 JDK 附带有 key 大小限制 - 将其限制为 128。如果您的安全策略使用的 key 大小大于此值 - 则会引发异常。

解决方案:

您需要使用 Java 加密扩展 (JCE) 无限强度管辖策略文件修补您的 JDK。

Instructions on how to download JCE Policy files

源代码:java.security.InvalidKeyException: Illegal key size or default parameters